Electrically heated cooker



Filed Oct. '3. 192'! s Sheets-Sheet 1 July 14, 1931. V w. c. WHITEELECTRICALLY HEATED COOKER Filed Oct. 3, 1927 5 Sheets-Sheet July 14,1931. w, c, w rr 1,814,103

ELECTRICALLY HEATED COOKER Fil ed Oct. 5. 192 5 Sheets-Sheet 3 July 14,1931. w. c. WHITE 1,814,103

ELECTRICAIILY HEATED cooxsn Filed Oct. 3, 192 5 Sheets-Sheet 4 July 14,1931. w. c. WHITE 1,814,103

ELECTRICALLY HEATED COOKER Filed Oct. 3, 192 5 Sheets-Sheet 5 LIZPatented July 14, 1931 UNITED STATES PATENT OFFICE WILLIAM 0. WHITE, OFPORTLAND, MAINE, ASSIGNOR T INDUSTRIAL DEVELOP- KENT & MANUFACTURINGCORPORATION, OF PORTLAND, MAINE, A CORPORATION 01 MAINE ELECTRICALLYHEATED COOKER Application. filed October 3, 1927. Serial No. 223,576.

This invention relates to an electrically heated cooker, which includesa kettle, a jacket surrounding and spaced from the kettle, andelectrical heating units located in the space between the kettle andjacket to heat the kettle.

One object of the invention is to provide a cooker in which the heatingunits are in direct contact with the kettle and adapted to lo quicklyand elfectively heat the latter.

. Another object is to provide a cooker, the kettle and jacket elementsof which are separab-le, and the heating units are readily accessiblewhen said elements are separated.

Another object is to provide a cooker, the heating units of which formmembers of a cage fixed within the jacket, the kettle being removablysupported by the cage in heating relation to the heating units andspaced from the jacket, the arrangement being such that when the kettleis removed, free access to the heati units is permitted.

Other 0 jects will appear hereinafter.

Of the accompanying drawings forming a part of this specification-Figure 1 is a side elevation of a cooker constituting one embodiment ofthe invention.

Figure 2 is a top plan view of the same.

' Figure 3 is a vertical section.

Figure 4.- is a section on the planes indicated by the line 44 of Figure3.

Figure 5 is a fragmentary sectional view, showing a portion of thejacket.

Figure 6 is a section on line 6-6 of Figure 5.

Figure 7 is a section on line 77 of Figure 5.

Figure 8 is a fragmentary view, showing my a portion of the kettle.

Figure '9 is a diagrammatic View. Figure '10 is a View similar to Figure3,

showing another embodiment of the invention.

Figure .11 is a fragmentary side View of a portion of the kettle and oneof the heating units shown by Figure 10.

Figure 12 is an enlarged section on line 1212 of Figure 11.

The same reference characters indicate the same parts in all of thefigures.

I will first describe the embodiment shown by Figures 1 to 8, inclusive.

12 designates a jacket, the upper portion of which is preferablycylindrical, and the bottom substantially hemispherical. Fixed to thepacket 12 are upper and lower supporting members, projecting inwardlyfrom the inner surface of the jacket. Each supporting member ispreferably a unitary annular structure including an outer ring 13, fixedas by riveting, electric welding, or otherwise, to the jacket, an innerring 14:, and radial arms 15, connecting the rings and spacing the innerfrom the outer ring, as best shown by Figures 5 and 6, so that the innerring is spaced inwardly from the acket. In this instance, the lowersupporting member fixed to the bottom portion of the jacket and has thedished form shown at the lower portion of Figure 5.

Fixed to and extending between the up per and lower supporting membersare heatmg or resistance units or elements 16, which. may be of anysuitable construction and ma terial, and may be elongated strips, eitherround, square, or oblong in cross section, or wires wound on strips ofinsulating material.

Each unit 16 is mechanically connected at its opposite ends with thesupporting members by any suitable means, as by end strips 17, fixed tothe inner rings 14, and insulated therefrom by interposed insulation 18(Figure 5). The units 16 are offset by the supporting members from theinner surface of the jacket and constitute, with said members, asupporting cage within the jacket, said cage being contracted at itslower end, as shown by Figure 5.

The units are provided with conducting terminals 19, which areelectrically connected with terminals 20 of lead wires, included in aheating circuit, said wires being grouped :1.

in tubular sheaths, the wires and sheaths forming cables 20a extendingthrough the jacket wall into a connection box 21, in which theconnections are made. The connection box may be supported by a base 22(Figure 1) adapted to support the cooker above a floor.

23 designates the kettle, which is formed like and is smaller than thejacket, its external form being such that it is adapted to be supportedby the cage formed by the sup porting members above described, and theheating units 16. The kettle 23 is removably inserted in the cage,sothat its outer surface is in direct contact with the units 16. Themouthof the kettle is surrounded by an outwardly projectng flange 24,bearing remov ably an annular seat formed by the top of the jacket, asshown by Figure 3. To the bottom of the kettle is fixed a drain pipe 25,adapted to enter an orifice 26 (Figure 5) in the bottom of the jacket.The orifice 26 is surrounded by a downwardly facing seat 26a and thedrain pipe is externally threaded and provided with a nut 29 adapted tobe set up against the seat 2641 and detachably secure the kettle to thejacket.

WVhen the kettle is removed, the heating units 16 and their connectionsare exposed,

so that they may be conveniently repaired and renewed.

27 designates a lining, of any suitable heat-insulating material, whichis a nonconductor of heat and electricity, molded on the inner surfaceof the jacket, and backing the heating units 16, to confine the same inoperative relation to the kettle. Said lining is provided with recesses28, in its inner sur-- face, forming working spaces at opposite ends ofthe heating units into which the terminals 19 and 20 extend, so thatsaid terminals may be conveniently connected and disconnected in saidspaces when the kettle is removed.

The kettle is provided with a cover which,

in this instance, includes an outer shell 30 and an inner shell 31, anda filling 32 of heatinsulating material. The margin of the cover isseated on the flange 24 of the kettle,

and may include an annular weight 33, adapted to hold down the coveragainstrelatively low pressure in the kettle. If desired, the cover maybe positively confined by clamps of well known construction. The cover,indicated at 38 (Figures 1 and'2), may be provided with handles 34, arelief valve 35, a pressure gauge 36, and a thermometer insulatingmaterial 42 between the shells.

The bottom of the jacket has an opening from which a tubular shellportion 43 projects downwardly. The kettle 44 has an outwardlyprojecting annular flange 45 at its top bearing removably on an annularseat formed by the top of the acket, and a drain pipe 46 extendingdownwardly through a. seat 47 fixed to the jacket preferably by spiderarms 48 connecting the seat with the tubular shell portion 43. The drainpipe is externally threaded and provided'with a nut 49 which is set upagainst the seat 47 to detachably secure the kettle to the jacket.

Each of the heating units 50, of which there may be any desired number,is circular in cross section and has the inverted U-shape shown byFigure 11. The external surface of the kettle 44 is provided withgrooves 51 (Figure "12) fitting the inner sides of the heating units 50.The units are confined against the external surface of the kettle byhoops 52. The neck 50a of each unit bears on the neck portion of thecorresponding groove 51 to prevent downward displacement of the unit.One leg of each unit is longer than the other as shown by Figure 11, andthe ex-' tremities of said legs are bent to extend vertically and fixedto horizontal rings 53 of different-diameters and surrounding the outletpipe 46, as indicated by Figure 10. The

lead wires included in the heating circuit and designated by 54 areconnected with the 2 tached thereto, and the rings 53 are remov-- ablefrom the jacket so that the units are ex posed and accessible. 1

I prefer to electrically connect the heating units of each embodiment ofthe invention in groups of which there may be any suitable number, threebeing shown diagrammatically in Figure 9, these being designatedrespectively by 1, 2 and 3. The heating circuitincludes a switch,including a revoluble arm 38, and conduits 1a, 2a and 3a, the wiringbeing as shown by Figure 9. When the switch arm touches only the contact1a the circuit is closed through the units of group 1 only. WVhen theswitch arm touches the contacts 1a and 2a the circuit is closed throughthe units of groups 1 and 2, and

when the switch arm touches the contacts.

1a, 2a and 3a the circuit is closed through each of the groups.Difierent cooking temperatures are therefore obtainable.

I claim:

1. An electrically heated cooker, comprising a kettle having anexternally threaded drain pipe fixed to and projecting downward from itsbottom, and an outwardly projecting flange at its top, a Jacketsurrounding and spaced from the kettle, the top of the jacket having anannular seat for the kettle flange, heating units contacting with theexternal surface of the kettle, said units being included in an electricheating circuit which includes leads extending through the jacket wall,the jacket being provided with a downwardly facing seat apertured toreceive the drain pipe, and a nut engaged With the pipe and adapted tobear on said seat and detachably secure the kettle to the jacket.

2. An electrically heated cooker, comprising a bowl-shaped jacket, upperand lower supporting members fixed to the jacket and projecting inwardlyfrom the inner surface thereof, heating units supported by and extendingbetween said members and ofi'set thereby from the inner surface of thejacket, said members and heating units forming a supporting cage withinthe jacket, said units being included in an electric heating circuitwhich includes leads extending through the wall of the jacket, and abowl-shaped kettle seated on said cage and contacting with the heatingunits to receive heat therefrom, the kettle being removable to exposethe cage and permit renewal and repair of the heating unit elementsthereof.

3. An electrically heated cooker as specified by claim 2, each of saidsupporting members being composed of an outer ring fixed to the jacket,an inner ring, and arms spacing said rings apart, the heating unitsbeing mechanically secured to and insulated from the inner rings.

4. An electrically heated cooker as specilied by claim 2, comprisingalso a heat-insulating lining molded in the acket and backing theheating units to confine the same in operative relation to the kettle,said lining having recesses in its inner surface, forming working spacesat opposite ends of the heating units, into which terminals of theheating units and the circuit leads extend, so that said terminals maybe connected and disconnected in said spaces.

In testimony whereof I have atfixed my WILLIAM C. WHITE.

signature.

